Cutting-tool.



UNTTED sTATEs PATENT oEErcE.

l SAMUEL A. WEGLAND, ,QF CHICAGO, ILLINOIS, ASSIGrNR, TO RICH TOOL COMPANY, '0F

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

` CUTTING-Toor..

Speccation of Letters Patent.

Patented Oct. 12, 1915.

Application filed April 16, 1912. Serial No. 691,167.

To all rwhom it may concern.'

Be it known that I, SAMUEL A. WEeLAND, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois; have invented certain new and use# 'ful Improvements in Cutting Tools, of Whichthe following is a specication.

This invention relates to tools adaptedto a .longitudinal section therethrough; Fig. 3

is' an enlarged detail in section of the s hank and tool socket therein; and F 1g. l 1s an enlarged' detail in section of the head of the tool. v

, The l'invention comprises two principal elements, viz., a tool proper 5 and a shank 6 formed of a size and taper adapted to be received; within a drill press (not shown). The shank is provided at its enlarged end with a head"7 having a tapered socket 8 formed therein, a portion'9 thereof being threaded.' The tool which, for purposes of' illustration, is here represented as a drill, 1sl

formed witlrahead 10 tapered to conform with the sccket 8, and with a threaded portion 11 adapted .to engage wlth the threads 9 in the shfank socket. The shank and tool -portions are further constructed of different qualities orf-kinds of steel, the former being so constituted as4 .to withstand torsional strain and'made preferably of axle steel, and the latter, to cut or engage with the work, and-madeV preferably of tool steel. 1

It has been customary to construct .tools with a shank to be-received within a drill press, the whole necessarily being formed of tool steel, in order to constitute a serviceable instrument. cost of-this grade of steel, however, tools of this character are highly expensive. .Furthermore,"the steel employed in` such tols, while adapted for cutting purposes, does not of the tool steel used in ofexpense. Approximately ene-half e" On account of the high' possess as high a degree of torsional strength as is desirable for high speed tools. This difficulty is overcome in the present int vention byconstructing the tool, as a whole, of two separable parts, the materials of which/"they are constituted being such as to adapt them best to the functions which they are called upon to perform. The necessity of constructing tools operated at high speed of suicient strength to withstandthe additional torsional strain involved has frequently demanded a sacrifice in the quality the construction of the tool. Y

The present invention is further characterized by the means which have been devised to effect a connection between thef tool and its shank. Accurate centering of the tool with lrespect to the shank is provided by arranging a taper on the head of the l tool adapted to register and conform with a,` similarly arranged taper upon the socket" walls, this engagement of the tapered tool 'head within the socket also tending to pre- .vent any loose play therein. Thethreaded portions 9 and 11 have beenl arranged to cooperate withl the tapered engagement to bringA the tool head tightly against the tapered socket and to maintainthe parts in such engaging relation. When so connected the tool is at all times centered and preserved against lateral or longitudinal movement. Vhen the tool is operated at high speed, the torsional strain which --might otherwise ordinarily be communicated to the' engaging threads is distributed and minimized through the engaging 'taperedt surfaces of the tool head and shankfsocket.- Itis possible not only to manufacture tools of the above character at a censider-- ably less cost than is usually the case, but also to supply or renew the tool portions thereof from time to time with a minimum high grade tool steel which is required un the construction of a tool and its shank is eliminated. A single shank may obviously1 be used with a number of diderent tools varying Vconsiderably as to their size and character. It is apparent, therefore, that, in the construction described, it is possible to produce a tool specially adapted for high speed purposes which combines i with economy in manufacture a more substantial construction thanlhas heretofore been sev cured.

' to engage the tapered part of said socket,

I claim:

In a device of the class described, the cornbination of a shank member ormed of axle steel, and provided in its lower end with a circular socket, having the lower portion of its walls tapering toward its inner end, and

having that portion of its walls above said tapered portion threaded, a. cutting member formed of tool steel, and provided at its upper end with a circular portion tapered and havlng its extreme end portion threaded 15 lto engage a threaded part of the socket, the tapered portion of the cutting member being of a size whereby,4 when the two mem-- as described.

. SAMUEL A. WEGLAND.,

Witnesses: f

J. Fox, CHAUNCnr Moonmon. 

